Light screening in lichen cortices can be quantified by chlorophyll fluorescence techniques for both reflecting and absorbing pigments.

Planta
Knut Asbjørn SolhaugYngvar Gauslaa

Abstract

Lichens, representing mutualistic symbioses between photobionts and mycobionts, often accumulate high concentrations of secondary compounds synthesized by the fungal partner. Light screening is one function for cortical compounds being deposited as crystals outside fungal hyphae. These compounds can non-destructively be extracted by 100% acetone from air-dry living thalli. Extraction of atranorin from Physcia aipolia changed the lichen colour from pale grey to green in the hydrated state, whereas acetone-rinsed and control thalli were all pale grey when dry. Removal of parietin from Xanthoria parietina changed the colour of desiccated thalli from orange to grey. Colour changes were quantified by reflectance measurements. By a new chlorophyll fluorescence method, screening was assessed as the decrease in incident irradiance (PAR) necessary to reach identical effective quantum yields of PSII (Phi(PSII)) in acetone-rinsed and control thalli. Thereby, we estimated a screening efficiency due to cortical atranorin crystals at 61, 38, and 40% of blue, green and red light, respectively, whereas parietin screened 81, 27 and 1% of these wavelength ranges. Removal of atranorin caused similar levels of increased photoinhibition for P. aipo...Continue Reading

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Citations

Oct 31, 2013·Natural Product Reports·Khanh-Hung NguyenSophie Tomasi
Nov 4, 2015·Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life·Annette BrandtSieglinde Ott
May 3, 2011·Journal of Photochemistry and Photobiology. B, Biology·Jozef KováčikSilvia Malčovská
Oct 6, 2015·The Science of the Total Environment·Yngvar GauslaaKnut Asbjørn Solhaug
Jul 19, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Beatriz Fernández-MarínJosé Ignacio García-Plazaola
Feb 11, 2020·Annual Review of Plant Biology·Melvin J OliverJ Derek Bewley
Sep 25, 2019·Annals of Botany·Beatriz Fernández-MarínJosé I García-Plazaola
Sep 19, 2020·Remote Sensing of Environment·Nea KuusinenMiina Rautiainen
Mar 7, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Marwa KerbouaJesus Miguel Lopez Rodilla
Apr 17, 2021·Frontiers in Microbiology·Maria GrimmKatharina Riedel

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